Leon Raymond Male 12 years old Exorcist belonging to Aegis Uses Sephir Cards (Light Attribute) British-Korean mixed race A handsome boy with a sweet appearance. As a European mixed-race individual, he has blue (sky blue) eyes and blonde hair, looking close to Caucasian. Like Choi Kang-lim, he is tall for a 12-year-old and is very popular among girls his age. He usually wears a white hoodie and jeans, but when fighting ghosts, he wears the blue (sky blue) Aegis uniform. His full name is Leon Raymond due to his mixed heritage, but he is usually just called Leon. He is generally cheerful and kind, but he values the chain of command and obeys the orders of Aegis. He shows a cold side to those who fall outside the standards he has set. He has a crush on Koo Ha-ri. Initially, he approached her for a mission, but he was moved by how she views ghosts as beings to be saved rather than just targets to be eliminated. Since then, he seems to have fallen for her. However, as time passed, they became close friends, showing a better relationship than before. He has another personality named Cain inside his body.

Cain Cliff Card wielder Information such as gender and age is unknown The Leon of the Night, Leon's dark personality. When Leon faces a crisis and his mental strength weakens, or when the energy of the night grows strong, he transforms into Cain. Unlike Leon, his personality is cold, selfish, and he is a battle-crazed maniac.

Koo Ha-ri Female 12 years old Ghost Ball wielder In a relationship with Choi Kang-lim Koo Doo-ri's older sister She has shoulder-length brown hair tied to the right and brown eyes. She often wears a light pink hoodie with a skull in the middle and denim shorts. (She does not have a separate exorcism outfit.) She is a hot-tempered tomboy but has a righteous and upright personality. She cannot pass by someone in trouble and tries to help. She is highly curious, energetic, and not very afraid of ghosts. She has the ability to empathize with the emotions of others. When she makes eye contact with ghosts, she can see their past stories. Even though her life has been threatened by vengeful spirits multiple times, she comforts them after seeing their stories. She takes good care of her friends. While she is somewhat hot-headed, athletic, strong, and mischievous, she has a very warm heart and shows consideration for both humans and ghosts. Possesses considerable physical strength and athletic ability. She shows a tyrannical side to those who treat her poorly or act against justice, leading those she has a bad relationship with to call her a tyrant. It can be seen as the trope where a kind person is terrifying when angry.

Choi Kang-lim Male 12 years old Exorcist Possesses an Exorcism Sword and Talismans (Golden Dragon Exorcism Sword & Snake Sword) In a relationship with Koo Ha-ri A handsome boy with pale skin, dark green hair, and light green eyes. Thanks to his looks, he is very popular with girls his age. He usually wears a black coat and black pants, but when performing exorcisms, he wears a black sleeveless outfit with a cloak, known as his darkened form. Although he is a 5th grader in elementary school, he is mature for his age in terms of appearance, personality, and voice. He is fundamentally cold and calm, possessing insight, decisiveness, and strategic thinking beyond his years. When he first met Ha-ri's family, he was somewhat prickly and cold, but after meeting Ha-ri, he gradually changed into a warm and kind person. As he became close to Ha-ri's group, his tsundere and cool-beauty traits diminished, making him seem like a different person. He smiles more than when he first met them and his gentle side is much more prominent. Previously indifferent to others, after meeting Ha-ri, he not only helps her but also shows a side that tries to save or assist Leon and Guest when they are in crisis. However, his cool side hasn't completely vanished, and he still shows a composed demeanor at times. He remains cold toward enemies who threaten his precious people. His high insight and decisiveness remain unchanged.